Preheat your oven to 180ºC (360ºF) or heat up the air fryer to 160ºC (320ºF). Grease a skillet or a ramekin with cooking spray or oil.
In a bowl stir together Greek yogurt, cocoa powder, granulated sweetener, coffee powder and pinch salt. Mix well until all is combined.
Stir in protein powder, oat flour and baking powder.Mix until the batter reaches a smooth texture. If you make the brownie base with vegan protein powder or casein you may need 1 to 2 tsp of milk to fix the consistency.
Transfer protein brownie batter to the prepared skillet or ramekin.
Prepare the cookie dough. In a bowl, combine oat flour with peanut butter, granulated sweetener and a pinch of salt. Add chocolate chips and stir until you get a cookie dough.
Spread the cookie dough over the brownie base.
Bake in hot oven for 10 to 12 minutes or air fry for 8 to 10 minutes.
